Jonathan hatch



l HATCH PAPER TRIMMBR.

N0. 62,486. Patented Feb. :26,v 1867.

gleiten tsttrs atent @frn JONATHA N HATCH, 0F SOUTH WINDHAM, CONNECTC UT. Letters .Patent No. 62,486, dated l'f'ei/'uarj/ 26, 1867.

PAPER TR'MMBR.

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'ro ALL wHoM 1T MAYcoNoERN:

Be it ltnown that l, JONATHAN HATCH, of South Windham, in the county of Windham, and State of Connecticut, `have invented a certain new and useful improvement on Paper Trimmers or Slittcrs, of which the following is a full, clear, and exact description, reference heing` had to the accompanying drawing, lforming part of this specification, and in whichl Figure 1 represents' an end view of my improved trimmers or slitte-rs as in operation, one of said trimmers, in outline only, being represented in red lines; and

Figure l a section of the same at right angles to fig. 1.

Like letters indicate corresponding parts in both 'iigures.

In the manufacture of paper it is usual to cut, or, as it is termed, trim or slit the sheet as it issues from the machine or reels by means of rotary cutters, which usually consist of an almost ilu-t steel plate or ring, bevelled outwardly on its edge, and screwed Vto a stock.. These trimmers are arranged to run in pairs, and in reverse directions, one above the other, on parallel horizontal shafts suitably geared 'and driven, the faces of the trimmers being pressed one against the other by a spring, or otherwise, to effect the cut. Another form of slitter, similarly operating in pairs, has been that of a steel hand or hoop circumferentially embracing a stock, and with its face or cutting edge slightly bevelled. The main objections to theirst-mentioned description of slit-ters are their want of durability, and the difficulty there is in hardening them, in which process many of them crack; while thelast-mcntioned description are objectionable on account of their frequent dulling, and, having broad, tlat surfaces that come in contact with ,a tight-drawn sheet of paper, the under slitter pressing. upwards and the upper one bearing down, they are very liable to hren-k lor tear the sheet on its edge, thereby giving a rough finish to the edge of the reatn or bundle.

My-present improvement obviates these defects; and the nature of my invention consists in constructing the steel blade or rotary cutter of a deeply-sunken forin or dish shape, with its outer edge slightly attened, or of a slow inward bevel, the sloping sides of the cutter being straight and of an equal thickness, by which construction the cutters are made self-sharpening and more durable and said invention further consists in securing the cutter so constructed to the stock which carries it by embedding it for a considerable portion df its depth in the rear in a dish-shaped recess, formed in the stock, and holding it therein internally by a bevel-edged ring or washer, secured to the stock hy screws or their equivalents, whereby'the stock need not protrude in front of the cutter, and whereby the hitter is wedged-to its'seat in the stock, the cutter readily attached and detached, and the same stock answering, in case of wea-r, to accommodate new cutters.

Having thus specified thcobjects, advantages, and, more or less mnutely, the construction of my intention, 'the following brief description of it with reference to the accompanying drawing will sutlice, in connection with what has been said, to fully explain the same:

AA are theeutters'; B B their stocks; and C C their shafts, en which the stocks are restrained from turning, in' the usual manner. Said cutters are arranged and operated as other cutters for cutting, trimming, or slitting paper or other material. They importantly differ, however, in construction and mode of holding them to their stocks. Thus, each cutter is formed into a dish-shaped blade of circular forni, and of an equal thickness throughout, by. say, pressing them out of a ila-t ring into a dish-shaped die, and may he afterwards ground or finished in the usual way, with their outer edges, a a, at right angles to their axial-line or slightly bevelling inwards, and their sides', which gives them the dish shape, lying at an angle relatively to said axial line, approximating the` same angle that they form relatively to a vertical line drawn at right angles to their axis- The cutters, thus constructed and made to bear by spring or other pressure with their mouths 0r fronts one against the other, become self-sharpening, and may be kept in use till worn so as to only slightly protrude from I their stocks, in which they are held by being seated indish-shaped recesses, and secured in front by internal i nevel-edged rings, D D', fastened to the stocks by screws' b l. This mode of holding the cutters wedges them to their seats, and affords `every convenience for replacing theml by new cutters, While, as both the stocks and the holding rings D D may be considerably in rear of the front edges of the cutters, there is nothing to interfere with a free, open' spacebetween the shaft of the cutters and said edges, even when the latter are Worn down low towards the stocks bythe self-sharpening action of the cutters.

2 n v um What I claim herein as new and useful, and desire to secure by Letters Patent,is-.

1. The 'self-sharpening dish-shaped cutters A A', with their sides :md front edges a rl, constructed as described, and arranged for operation relatively to each other substantially :ts :md for thepurpose or purposes herein set forth.

2. The combination with-the dishshapec1 cutters A A', constructed ne deseribed, and their recessed stocks B B', of the wedge-shaped or beveiiefl-c'lgefl rings D D for holding the cutters to their stocks, all arranged essentially s specified.

JONATHAN HATCH.

Witnesses.

C. YERGAsoN, S.' C. KINN. 

